work ethic。

can anyone tell me what is "work ethic"?

• leave office without any notice
• read paper during working hours
• do work only when you are told
  
• call the boss that you are going to have a meeting after leaving for lunch
• email the boss you are sick and have to go home, while your boss just sit not far from you

um... it doesn't really bother me much.
just don't understand how on earth will have this kind of irresponsible person.